The warnings follow a statement attributed to Supreme Leader Mojtaba Khamenei on Saturday, ordering Iran's armed forces to prepare for retaliation without geographic restrictions and expand their list of potential US and Israeli targets.
The hardline daily Kayhan went further, arguing that American and NATO facilities "in the heart of Europe" could be targeted if US and Israeli attacks on Iran resume.
The newspaper named military facilities in Cyprus, Greece, Romania, Albania, Italy and Britain, as well as the joint US-British base on Diego Garcia in the Indian Ocean.
Military commanders signal broader reach
Iran's Army spokesman, Mohammad Akraminia, said renewed fighting could spread beyond the countries and territories involved in previous rounds of the war.
"In the recent war, the conflict extended from the occupied territories to US bases in regional countries, but if another attack takes place, the geography of the war could expand beyond West Asia," he said.
He added that Iran was updating its list of potential US and Israeli targets.
A senior Basij commander, Ghassem Ghorayshi, also said Iran's armed forces would no longer be bound by previous limits on missile range, target selection or the scale of operations.
"In the past, target selection and missile ranges were restricted," he said, attributing those limits to decisions made under former Supreme Leader Ali Khamenei.
"From now on, the armed forces will have no restrictions on striking targets, determining missile range or the scale of missile operations," he added.
The remarks do not by themselves establish that Iran has developed new long-range missiles or formally changed its military doctrine.
Iranian newspapers identify European bases
A separate report in the newspaper Hamshahri also raised the possibility of targeting American military infrastructure in Europe, including air bases, logistics centers and support facilities.
The newspaper cited speculation that Iranian missiles could reach targets 4,000 to 5,000 kilometers away, significantly beyond the roughly 2,000-kilometer range Iran previously described as a self-imposed limit.
However, those longer-range estimates remain disputed, and the ability to extend a missile's theoretical range does not necessarily establish its accuracy, payload or operational effectiveness.
The reports reflect a broader shift in Iranian rhetoric toward threatening American military infrastructure outside the Middle East.
Western defense experts have offered more cautious assessments of Iran's long-range strike capabilities. The Washington-based Center for Strategic and International Studies lists Iran's principal ballistic missiles with ranges generally around 2,000 kilometers, with some variants potentially reaching 3,000 kilometers.
Britain’s Royal United Services Institute has said strikes as far as the UK may be theoretically possible, but would involve smaller, less accurate warheads traveling through defended airspace.
Lawmakers warn of wider conflict
Hassan Ghashghavi, spokesperson for parliament's National Security and Foreign Policy Committee, warned that renewed fighting could spread far beyond the countries already affected by the war.
"I don't want to use the term World War III, but the geography of the war would be almost on the scale of World War III," he told Iranian media.
He said another conflict would be considerably wider than the previous 12-day and 40-day rounds of fighting.
Ghashghavi also suggested that Iranian retaliation could affect civilian infrastructure and everyday life in countries involved in attacks on Iran.
"If they leave your people in darkness, you should leave their people in darkness too," he said.
In another warning, Tehran lawmaker Kamran Ghazanfari said Iran could retaliate against US assets in Europe and potentially on American territory if Washington used military bases in Arab states to attack Iran.
Ghazanfari also speculated that Iran might already possess nuclear weapons, without providing evidence. Tehran has not officially announced that it possesses a nuclear weapon.
Tehran links warnings to negotiating demands
The military warnings have come alongside renewed Iranian demands in negotiations aimed at ending the war.
Parliament Speaker Mohammad Bagher Ghalibaf said Tehran had delivered a "firm and rational response" to Washington and that "the ball is now in America's court" to prevent renewed fighting.
Iran's armed forces chief, Ali Abdollahi, separately outlined five conditions for lasting regional security: an end to fighting on all fronts, particularly in Lebanon and Gaza; the lifting of sanctions and release of frozen assets; war reparations; recognition of Iranian authority over the Strait of Hormuz; and guarantees against renewed attacks under a new regional security framework.
The demands come amid diplomatic efforts involving Qatar and other mediators, although a senior Iranian official told Reuters on Tuesday that Tehran and Washington remained far from an agreement.